Sorry to continue a line of conversation that didn't need to start, but 25 is not a power of 2. It's a square, sure, but not a power of 2. Powers of 2 are 2^n. Squares are n^2. 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, etc. are powers of 2. You're also right that the human mind understands things in fives well. That's why the roman numeral system is based on fives. Of course, we use tens, but whatever.
@TehSilentOne: I'm not sure what you meant to type, but what you typed was not correct. Both of those are powers of 2.
Enough about math and common tile sizes. Lets see some new tile attempts from araknidkid and move on.