I found blue plastic cups at BJs wholesale club. They are clear, but a sharpie works well on them to write the names.
What are you using to punch the holes? I usually just cut the bottom of the cup in three places. They are easy to cut. My hole puncher didn't reach the bottom, so I use scissors.

digger,
Use a saudering iron to melt holes VERY QUICKLY...I do it on the top of my stove and run the exhaust fan while burning the holes.

Our Kroger here has the solo cups all the time.

Dora

I use a very sharp pointed tweezer to make hole in the bottom of my solo cups. I use a scissors to cut two edges off the bottom of the cups for drainage.
Fred in NJ

I just use a drill. grab a stack of cups, drill right through the inside, out the bottom, and pull back up to prevent pieces around the hole from sticking out the bottom and making the cup uneven.

A drill is an excellent idea. I had been following Dora's advice and heating a small philips screwdriver.

I might have a hard time with my eggbeater type hand drill though. Some of us aren't very condusive to change.

Thom

I too use a drill; I can do about 100 in less than a minute. The fumes from melting the plastic can't be healthy....

Barbara

What size bit do you use? I'm all for doing it quickly and effectively.

Dora
I hate the fumes but so far, the exhaust has removed the fumes. I like the idea of the drill.

I'm not sure what size bit it is off the top of my head. Just depends how large you want the holes to be.

My dh drilled the solo cups with a 1/4" drill bit. Mine seem to be fine. Hope this helps. pattykay

Here in Seattle I find them at my local Bartell Drugs and also the short clear plastic party cups that are perfect for a bit bigger violets.....:0)..marigene

Hi everyone, I like to use an ice pick and punch a few holes in solo cups that way,its quick and easy.

I use an inexpensive wood burning tool from the craft store. I sit on the back step and can do a whole package of cups in a few minutes. I put 4 holes around the bottm of each cup, (but not in the bottom) at 12, 3, 6, and 9 o'clock. They drain well and usually don't crack around the holes because they are melted in. I also do this for 20oz beverage cups to start seed of almost any kind, 15 fit in a flat and they are nice and deep giving me nice root systems before they get plated outside. I have some that I have used for 4 years now, and at about 5 cents a cup you can't beat that.