Camille - rather than mirrors, try bouncing light off large sheets of white card, it gives a much softer light (although you may need to go light_source>mirror>card, depending on how far away you are from the light source!). Often better is more than one sheet of card so shadows are softened.
For small things, try using a "milk bottle softbox" - take a small white translucent plastic thing (milk bottle, tupperware, etc), cut the top and bottom off, put it over the object and shine light in from the side; you can also put foil on the other side to reflect light back in again. On small objects, this acts a bit like a giant "softbox" for soft, almost shadowless light, which can be good for certain subjects.
On a student budget, anglepoise lamps from Ikea etc. make passable light sources and are quite easy to position; the light will often be more pleasing after bouncing it off something!
---------- Post added at 12:21 PM ---------- Previous post was at 12:16 PM ----------
"sheet of card" should be pretty big - A3 minimum, bigger would be better.
---------- Post added at 12:23 PM ---------- Previous post was at 12:21 PM ----------
I've always thought a
focus rail would be a very handy accessory for macro flower photography. Moving an entire tripod (or often the subject!) is a bit painful.