I wanted to make my own original Sinestro Corps member, so I mixed a few parts and took a Marvel Legends Havok head (had several of those laying around) and came up with this guy. I chopped up an old whip accessory to make his ring, although I didn't take time to really detail the logo. I used a Sharpie to lay down a base for the fists, because the finish on OMAC's hands was so smooth, the acrylic paint would slide off. The Sharpie also helped with the elbow & knee joints, hiding any rubbing of the final paint. I painted his eyes Purple Pearl to give him an alien look.

Rx
Head: Havok
Body: Low/Maash (Green Lantern Classics)
Forearms: OMAC (DCUC)
Fists: OMAC (DCUC)
Lower Legs: OMAC (DCUC)

Paints:
Testors Model Master Acryl
Semi-Gloss Black
Insignia Yellow & Cadmium Yellow Light
Purple Pearl

Tamiya Color
Gold Leaf