I recently spent some on indirect investment in mining equipment at pyramining.com. It yields a 10% reward over 11months (you get your investment back in batches until 110% has been paid back). The reward increases if you refer others.

If you have spare coins lying around, you can invest them by using one of my referrals and have more to spend when you need them:
http://pyramining.com/referral/ndq9fmc83
http://pyramining.com/referral/t97hzemfy
http://pyramining.com/referral/x98hrac2s
http://pyramining.com/referral/engtbxy26
http://pyramining.com/referral/nkbreg2m9