Color blanks were available at Target. My son and I collaborated on these when he was ten. They came as blank white bodies with color markers and stickers. Flash has sculpted head wings. Batman has ears and cape made from blister pack plastic. Hal, Ray, Bruce, and Barry were all painted with acrylics.
The figures contained in the Custom Showcase are not for sale by Figure Realm, and the creators of the customs are no way affiliated with Figure Realm. The Custom Showcase is purely for entertainment purposes and only provides a means for the creators to show off their work and trade ideas. Figure Realm does not make or sell customs.