Paint some Nerf guns, I did. Pretty affordable and they take just about all types of paint. Good practice and a way to make some dough if you can pass them off on someone.
My brother has tons. i could ask him :D. ill just let it dry longer before adding the clear coat. Making it black was the hardest, overall play is decreased by 5-10% i got some paint on the spacers. (but i cleaned them) In the light it is amazing. I had to use cheap spray paint (mom doesn’t allow me to use her expensive paint ::))
Here is all the ones I own I have done. The rest I have done for my brother or sold to my brother.
Dragon Fly (green w/black splash)
Orange original ONE (Navy Speckle)
Green PGM Stackless (Painted Black w/ Arctic Blizzard Speckle, clear coat diminished it a little :()
Not a very good picture. I was to lazy to try harder ;).