If you make a template exactly the size you want, there must be places where you can get it cut. They would be able to tell you how to attach it but I would think liquid nails or silicon (Australian terms) would work.

Yes - as jradnell said, make a template as precise as you can, then find a stainless shop to fabricate it. Contact cement would adhere it well, as long as your walls are flat. Don't try to cut stainless, it can heat from the blade and discolor. Professional stainless shops use a break or shear to cut it. Look for restaurant supply or sheet metal shops.

Another option would be Formica (or similar product). They have some that mimic stainless - brushed, patterned, geometric shapes, etc...or even copper or other metals. Again, contact cement.

Or what about a combination of tiles? This one is too busy for the area you have, but it shows what can be done by combining different materials.

Have you looked into stainless tile? It's beautiful and practical.

Thanks for you three's suggestion.

In fact, as Carmel Decor mentioned, I like stainless tile very much. But still I am worried whether the gap between the stainless tiles will easily keep the oil and be made hard to clean??

I used the 1x1 inch glass tiles that come on a sheet (mine actually has some stainless tiles mixed in). I used a dark grey grout and have not had a problem seeing oil or food on it. You may be able to go over the grout lines with a sealant using a small artists paint brush.

Nancy is right Yogi - just butt them together. If you decide to use something with a grout line, you have two options for the gap - 1) grout and seal the grout with a high-quality penetrating sealer. Know that you will need to reapply the sealer every so often - at least once a year. Or 2) epoxy grout. They claim it to be stain proof - and of the times we have used it, I believe it. Good luck - Robert

if you're thinking of stainless-capped mosaics, you need a grout for the "gaps".
if you use the peel and stick stainless tiles that butt right together, you don't need to worry about grout.

Check out this cool backsplash! It's fabric behind plexiglass, and a DIY project. http://inspiringfoodd.blogspot.com/2012/09/a-backsplash-solution-for-rental.html

Any tiles you use on a backsplash would need to be sealed to avoid that grout stain issue. But there is no limit to what you could put up there. We frequently use a natural stone behind the cooktop and with the right sealer it's not at all a problem. Any ceramic or porcelain tile would also need the grout sealed. I would not let the concern about grout deter you from using a mosaic if that's what you want to do. it's not at all difficult and Dupont makes a spray sealer that is ridiculously easy to use. Shake, spray, wait 10 minutes, wipe down. Check out their site for details on it.

http://www2.dupont.com/Stone_Tech_Professional/en_US/products/Protect/advanced_grout_sealer.html

Tinsnips would cut thin stainless steel. Have you thought about having mirror made (black would look nice) up or even glass made up? Both can be bought reletivley cheaply from a glass merchants they would make to measure and you only have to buy the fixings or screw lids. Just for reference on how cheap this can be: I had a 4ft x 3ft Mirror made up by a glass merchants for my bathroom a few years ago and it cost me £30 roughly.

To seal Grout to avoid damage to the grout use car wax. It's brilliant at protecting tiles and grout (grout is porous and it puts a film over it to prevent water from being absorbed). especially in bathrooms. it stops watermarks and prevents black mould too, leaving you to shower squeegee and go. I re-apply once a month

I am going to have to argue against the carwax on grout solution mentioned here. Following the manufacturers recommendations for the grout is very important and, if you go outside those, they will not typically be very helpful if you come back to them for any issues down the road. Plus, with a good sealer, you only need to do it once a year or every other year, not every month.

Also, rereading your initial post, it actually sounded like you intended on just putting the mosaics directly on the wall without grouting. I don't think you're going to be happy with the finished look in that case. Most mosaics have a mesh mounting behind them which is visible if you don't grout. Grouting is not hard and not expensive and will give a much more finished look with easier maintenance than if you were to leave it with the mesh showing.

We are the manufacturers of metalcoated tile that can be cut or custom made to fit any area. Our products are used in backsplashes of all kinds and are easy to care for. Check out our Houzz page or visit Traditions in Tile who happens to be one of our dealers.

Epoxy grout is the best thing to use in a kitchen. Saves resealing, and is impermeable.