I thought I had a couple more in favorites but I'm running in place right now and don't know which folder I put them in. I think I found it with google. Search for tile layout, I think

Here is a link that might be useful: tile layout

I have tried a few things.

My kitchen is laid out in Google Sketch-up, and I learned how to create new materials in that program that I could paint onto the backsplash. The "materials" were jpegs that I made in Paint, using images of my tiles, and scaled appropriately to the size of whatever pattern I was trying out. This worked really well. Here are a couple of examples of patterns I posted for feedback:

To finalize my pattern for the tile guy, I ended up using Google Sketch-up to build the pattern directly. For my "materials" I used jpegs of each tile, made from photographs I took of the tiles, and cropped so that the whole image was a tile. For example

Here's part of my pattern built with Sketch-up:

You can download Sketch-up at the link below.

Here is a link that might be useful: Google Sketch-up

Did you have to pay for Google Sketch-up? And, did you draw your kitchen or were you able to upload images from your cabinet maker? Thank you