I'm back into sewing in a big way after giving it up for a long time, apart from curtains, cushions, and and the like for the home. I find it very soothing these days.
Good idea from a few people to pick up some old sheets, duvet covers, etc from charity shops. If it goes wrong, nothing much is lost, and it will give you some excellent experience. Also check out the 'old lady' dresses and stuff in charity shops. Some of the fabric can be amazing, and the bottom of an old dress can often be turned into a sweet summer skirt - I've just done one using a Monsoon size eight dress, which I turned into a size 12 skirt for my daughter.
You can find tutorials for many simple makes online - simple elastic waisted skirts, little girls shirred dresses, and so on.
Envelope closing cushion covers take very little time, and can look very professional and modern, especially if you embellish them in some way.
I also pick up fabric on my travels - I was in Sri Lanka last year and had half a suitcase full for about thirty quid! So if you're on holiday, check out any local markets - you can often get a bargain. If you're in the east (as well as Sri Lanka I was in Singapore a couple of years ago) you can usually pick up sari lengths for very little, about five and a half metres or so for about a tenner.
I could go on for ages.....sorry if I'm being a bit boring.