Got kids? Toys can be interesting up close, you can make them eerie or bright and contrasy fun macros. Lots of people do lego or mini toy soldiers etc ...
Put the 105mm to work last night. Took some food shots [was having steak] and then found this $5 bill left over from our recent NY trip -
http://www.flickr.com/photos/cagey75/8382878917/
Lincoln by Cagey75, on Flickr