I played with my share of Lego as a kid, but as I got older, I stopped messing with the little blocks much. My kids do play with Legos on occasion though and I get to build stuff with the little blocks. Many geeks take their childhood love of Lego to the next level when they get older.
We have seen all sorts of Lego creations like a Lego computer keyboard that looked cool, but didn't seem comfortable to type on. If you want the look of a Lego keyboard for your MacBook this cool set of stickers might work perfectly.
The stickers are made from Avery MPI material, I have no idea what that is, but presumably it will last. You peel them and stick them to your keyboard. The single set that was on Etsy has sold, but the vendor may make your more is you want.