What colors would you recommend I use?
before i suggest anything, i should clarify this goes more for the interior than exterior. the basketball court's red boundary is really too deep.
hex codes:
578F4D (olive green; if you use this use dark green for accenting)
AD3434 (duller, saturated red. something to replace the red border and keep the current red color scheme)
CCA393 (pastel sandy-red color for hallways/etc)
CCC593 (pastel sandy-yellow color for hallways/etc)
B8CC93 (pastel sandy-green color for hallways/etc)
this is just for you to get an idea of how to generate complimentary colors that work well together.
remember, warm colors = red, orange, yellow, and bright green (intermediate color)
saturate colors to get a less bold tone and more "background" feel.
lighter makes it recede more while darker makes the object stand out. lighter colors also make rooms seem slightly larger.