I painted this guy up the other day as part of the Immortal Host Commission. He's in charge of the Scout squad in this post.
It took a little bit of work to get all the Ultramarine symbols off of him. He must of had at least a hundred of them things. I even missed a couple and didn't find them until after I primed him.
I ended up greenstuffing a chapter symbol on his left shoulder and filling a large gap in his right near his wrist. He had a small Ultramarine symbol on his boltgun as well but it was tough to get off so I cleaned off what I could and filled in the area with a small patch of greenstuff.
To make him stand out from the other, younger Scouts, I painted his skin tone slightly different from the rest of the guys. Not so much that he stands out, but enough that it looks like he may be a bit "older" than the others. This was easy enough to do by just changing the wash I used on his face and then making sure to pick out the details in his beard.
My Project Link: Space Marines Commission