For the pinking shears look you can also use the Effects> Edges > Stamps>Shapes and change the shape to the diamond fill it with a colour not in your picture, have it overlap off the sides of teh shape and then us eteh magic wand/colour tool to remove teh colour
If this doenst make sense yell and i'll do a step by step
As for the rounded shape Im not sure exactly what you are after but you could try skewing it or just add your own shape. If you can give me an example I can see what I can do