The tri is fairly straightforward, with a couple of appliqued melons. Are you all getting used to doing them by now?
K10 looks fiddly, but OK as long as you check placement of the blocks. This is one that you should mirror if you want it the same as the original, but I forgot again!
C2 is similar to one already done, but I found this one easier. I appliqued the two larger (corner) triangles over the top of my diagonal seams.
C4 again looks a little fiddly, and might be for those of you hand sewing. PPers shouldn't have too many problems getting those strips ine the middle even. The inset seams in the outer corners are reasonable because of the gentle angle.
C7 might be tricky getting the diamonds lined up, point to point around the central square. If you have problems, try sewing them together with the largest stitch on your machine. If you haven't got them point to point, at least it is very easy to get the stitches out and you can try again.