Bird watching - Feed them fresh fruit - Baltimore Orioles love oranges and Cardinals love grapes. Orioles love grape jelly too and if you put out either one, woodpeckers really like them too. Butterflies like them too.
Cool idea how to hang I wondered about how to do this. Decorate a fence with hanging flower pots painted for lots of color and life. Project published in Better Homes and Gardens. Do it yourself DIY magazine Step-by-step:
Log Bird Feeder - 23 DIY Birdfeeders That Will Fill Your Garden With Birds (my note: I haven't looked at all of these, but at least one is a terrible idea. The window birdfeeder -- birds could fly into the glass and hurt themselves.