I am looking for some decal sheets with a solid color. Not the thick kind. The ones that are thin. Will go on foamie. Any ideas where to just buy sheets like this? Don't need customization.

Hello,

I only know from personal experience "Tailor Made Decals"...they are thin and excellent quality. Maybe they can help you.
Besides them, there are several places you can buy, maybe you can find what you need.

Hope this helps,

If you are printing decals yourself try Staples or Office Depot. I get mine from Amazon. several vendors sell solid or clear water slide and adhesive backed