that definitely doesn't sound like it would work

White ones would be cool too, but I can only find them for the DMG. Maybe I could melt it to fit...

If you're going to dye them then you want to use the light grey ones or even Kitsch-Bent's clear ones. But it will still probably rub off. I haven't been able to think of a good way to do this.
I know when you dye rubber or silicone it actually soaks into the material. So it will probably stay the color you want but it will rub off onto your thumbs.

I thought of dye, but dye only makes things darker, and the buttons are dark grey, so that wouldn't work for making bright green, but it's still a really cool idea if the buttons were originally white.

I was going to try using RIT dye for the DMG's Start/Select buttons but I'm pretty sure that it won't work.

If you want to test my hypothesis just submerge the buttons in a bath of really hot water+acetone+Rit dye for 10-15min.

Rubber, silicone, whatever it is. Essentially, the start and select buttons for my gameboy pocket. Anyway, what's the best way? Or, can you even paint them at all? I want them to match my buttons and backlight (lime green) and I can't find a company that makes MGB start/select buttons, much less green ones. Or if  you know where to buy some, that works too
Thanks
Dan