Keep it simple with just squares and rectangles. Windmills and any type of star will include triangles which mean you have to deal with stretchy bias edges.
Square in a Box (Lowena's avatar), railfence, courthouse steps and log cabin are all just rectangles and have lots of possibilities. Google any of those names followed by 'quilt' and you'll get dozens of ideas.
Assuming you are going for 2" or 2.5" cut widths, which is a fairly average sort of size, I reckon that for every square metre of quilt you will need about two square metres of fabric - so a pre-cut pack won't go that far! Decide on your colours, remembering that the contrast between the lights and the darks is more important than the actual hue, and get a selection of fat quarters.