Here are some tips to give character and personality to your room on a budget. In bathrooms with windows, fabric can make a big impact. Don't skimp on the fabric, and the room will look better. Use it on the windows, and also for the shower curtain. You can buy a very inexpensive white shower liner, and then use your own fabric to make an outside curtain for the tub area.
Sheets are wonderful, and there are some great prints to work with.
If you don't have a bathtub, use the fabric in other ways. If you have a sink without a cupboard under it, get some Velcro and glue it around the bottom of the sink. Then gather your fabric, attach Velcro to the top of it, and put it around the bottom of the sink. Get some Modge Podge and stiffen your fabric. Cover your trash cans, Kleenex boxes and as many other items that you can.