cocoa powder (depending in how tan you want to be.) + Any moisturizer + an empty bottle + mix it all together. Good for super light girls. So is this like a real tan? I don't think so. But I guess if you wanna be tan for a special occasion it could work
If you are having an outdoor reception, consider hanging lights like this, or twinkly Christmas lights strung all around. This is a simple way to create a stunning background for your photos and provide beautiful ambient lighting.