User interface

[Treewyrm]

This is just a mock-up in photoshop.

UI windows in FL are 3d meshes with pre-sorted depth, so technically they can be replaced entirely and not just recolored, but they'll always exhibit anti-aliasing unless you make them for the very specific resolution and forcibly turn off texture filtering for the entire game, so single-pixel borders aren't really practical to do, scaling will kill them anyway. Aside from that another problem for positioning would lie with text rendering, which in FL is done as a GDI overlay.