First off you will need a program:
Adobe Photoshop CS2: http://www.adobe.com/products/photoshop/tryout.html
Paint shop pro trial: http://www.corel.com/servlet/Satellite?pag...d=1047024307383
Ok im going to explain most of the types of sigs that people make.
Pixel Sig:
A sig made by just the pencil tool in almost any digital art program. This is by far one of the hardest sigs to make. You must outline with the pencil tool and then fill it in with color and last you must shade it.
Example of pixel sig:
Abstract Sig:
Probably one of the most popular sigs today. Abstract sigs are free form shapes that mostly look 3D. They usually have high color and are very high quality.
Example of Abstract Sig:
Grunge Sig:
Another very populer sig. This has a very dirty look to it. It's mosty very repetitive and has a lot of color as well.
Example of Grunge sig:
Grunstract sig:
A mixture of both grunge and abstract this is it's basically abstract with grainy and weatherd spots.
Example of Grunstract sig:
Photomanipulation: This is a sig that is started with a photo or stock image and has been changed in certain ways to make it look better or to your liking.
Example of photomanipulation:
Vector Sig: A vector sig is a very simple sig. It's all shapes with different sizes and with those shapes you have to be creative and place them in correct areas to look good.
Example of Vector Sig:
Tech Sig: A sig that is all very orgranized. It has lines that look very straight. It has a very futuristic look to it. And like the vector sig you must watch were you place the tech lines.
Example of Tech Sig:
http://www.deviantart.com/view/8864945/
Smudge sig: A sig made by only using the smudge tool. Usually you must smudge in a certain flow to get amazing effects.
Example of Smudge Sig:
Default Brush Sig: A sig made by filters and default brushes. This usually has a very nice result.
Example of Default Brush Sig:
Pixel Stretch Sig: A pixel stretch is a sig with a line of pixels and that are stretched from left to right.
Example of pixel stretch sig:
This guide should save some topics and hopefully will get pinned for others to use.
This is written by BlinX and can be used on any site as long as you tell that it was created by me.