Yeah it's the hardest job there is when modding ufo, at least for me. I hate making sprites. Big graphics are much easier and more fun to make. 95% of my sprites are rearranged, recolored or otherwise modified ones, in other words, made cheaply. I've only made maybe 1 or 2 sprites ground-up, and even them weren't from scratch (they were based on XCOM-0 sprite).