Red wool maybe? I googled Pallet town and the roofs were red, unless there's a specific version you're doing in which they're not.
well they don't look like roofs when they're red. they just look like derpy hats.
Of course, that was my first attempt, and is 1:1 scale, so it sucks.
And here's the version we put on the GF server. The version we're doing on the pokemon server is going to be completely different. It won't look anything like pallet from the original game, but that's because we want it to look like an actual town, which pallet...doesn't.
Some more pics:
Oak's Lab:
Inside Oak's Lab:
Ash's House:
Inside Ash's House:
We made pallet so we're a bit more familiar with how we're going to be doing things when we make the actual server