Generally, the rules, or guidelines for any 'good' or 'catchy' sig images are;
1. Stick to a colour scheme.
2. Make 1 focal point, too many will intern result in none.
3. Pic that colour scheme off your focal point/main image.
So, I will start with a render; which is an image with the background cutout, mainly designed for using in images, sigs, avatars, etc.
The render I am chosing is a Spartan/MasterChief.
This, is what I made after ~10 minutes.
I will make a video of me making a sig for someone, please give me some ideas for it, someone give me some text, and a render. I will get it done tomorrow, probably.
Sigs I have made for various people, not necessarily used, but I have made them. I have made more, but those are for
other people. I will remove their names and post them.