1.Open your Image you wish to use sig or what ever
2.Now Duplicate your layer
3.On your duplicated layer use the radial blur that can be found herehttp://www.gimptalk.com/topic.php?a=v&t=919&f=9 I used 20 Blur and 40 feather but you can also adjust to your taste
4.Go to filters and select animation and then select optimize for gif

5. Leave your blured layer at 100ms and set the bottom layer to 300ms or 400ms go with what you like best

6.Here is a tip if you look at my blue and white sig notice the darker blur around the edges and now look at my Steeler sig notice the yellow blur around the edges I used a 3pix border on the blue sig and a 1pix border on the Steeler sig make sure you border is on the outside of your sig not the inside but as you can see the thicker your border the better the effect is





