One of the funnest ways to add some poersonality in your forums (besides and fun and flashy avatar ) is to make a fun signature! But it can be tough to try to scrap at that size. I've made it easy for you in my new Siggy Templates!
I have my templates at 3600x1500 so that you can scrap them with regular-sized kit items. Then I include these instructions for how to resize it. Basically, add drop shadows and scrap your siggy and then merge all the layers together. Then, resize your signature down to 600x250- the max size signature allowed by SM forum. Have fun!