Here is that modded Game Boy Advance I mentioned in a previous blog post! If you hold "Select" then tap "L" and "R" simultaneously, it opens up a menu where you can select different screen modes and color filters. The first alternative mode is the best I think, as it looks closest to the original GBA screen-- just backlit, super bright, and one hundred percent uniform!
Here is the ebay seller. There are tons of people selling these, so I'm sure there are lots of other great people out there doing this work as well.
As for the second picture, I bought those from
this seller on Etsy. They look even better in person than in the photos-- the print quality is phenomenal, and they look so good sitting on my shelf!