LOL, yes ..
I noticed the very similar colors while repairing your broken Elk.
I'm responsible for that color scheme here and I can guarantee you it wasn't inspired by hybrid-piloten.de .. the hex values are different and I haven't visited your site for quite a long time:
Green:
#6aac2b Hybrid-Piloten
#7bb128 ElkArte
Blue:
#5ba9d9 Hybrind-Piloten
#43a8da ElkArte
If you feel offended by our scheme I'm tempted to change it here, could replace the green with a slightly darkened red or so..