I HAVE STICKERS! I fricken love them, so glad to see my art in sticker form. 
 
Check out the size of these through the photos provided. They are all roughly about an inch big. They are perfect to fit on phone covers, notebooks etc. I have tested them on my own phone and water bottle and they are quite durable. Not water proof though, but splash proof. I wouldn't put them on your car or anything because they are not decals. (Something I would like to make in the future!)
 
The plain stickers; €3.00 each
The Iridescent stickers; €3.50 each