I can set the back color when i am registering the class, e.g.:
wincl.hbrBackground = CreateSolidBrush(RGB(202, 238, 255)); RegisterClassEx(&wincl); <
wincl.hbrBackground = CreateSolidBrush(RGB(202, 238, 255)); RegisterClassEx(&wincl);
If you want a customized window you can create your own window class to draw that type of window. Implement a handler for wm_paint and draw whatever you want for the window. There are a lot of tutorials available.