Maybe do something inspires you. Is there a certain topic or place that you love more than anything?or even soemthing you like to do. If your into cars or a certain animal.
You could even do it for someone else as a gift.
Make a list of all the subjects that you would consider doing and then write pros and cons of each.
Most of all choose something that you will actually enjoy doing. otherwise you may get bored halfway through and do a sloppy job just to get it finished.