I ended up using the original lab house from Fire Red because the one that I originally wanted to use in my hack was really hard to recolor. I'll look around on my laptop to see if I still have it and I'll send it to you.
I personally don't use APE because I always have bad luck with it for some reason. I rather use hex editing. Using VBA-M to find the palette offset of the textbox or anything. There's a tutorial on this site called "How to Palette Edit Anything." It's really useful!