being an old university student myself i have had the same problem. Now me and my gf hasnt been using many "toys" yet, that may come later but the ones we have used are as follows:

for robe: scarfs (then things you use around your neck when it is cold), different clothes aka pants.

blindfold: scarfs, headband etc.

punishment: well that old brush looks promishing (it does work wonders trust me )

well thats about it, we still have a lot to learn things that might work are:

electrical wires for bondage (off course unplugged), spatulas, vegetables, microwawe oven (no just kidding ). cant think of more atm, hope there was something you could use. happy hunting