You may have seen the helmet logo concepts that were going around the internet.
(You can see a lot more, and quite frankly, a lot more well executed ones at Chris Creamers Sportslogos.net Forums).
Anyway, I decided to create a little tutorial for a small detail that can have a big impact on the overall look of the concept.
First, find the logo you want. If you are using your own logo, hopefully it is a PNG image since those are easier to work with in these situations. Larger images are also more helpful.
For this tutorial, I am using a Patriots logo from wikipedia.
NOTE: Not pictured in the tutorial. After Step 2, duplicate the layer.
STEP 1. Paste the logo into your GIMP image.
Here is an example of the logo on a helmet. (Helmet template by Fraser Davidson).
Thanks for reading, hopefully this tutorial is helpful in creating some concepts.