Often overlooked, Smart Folders can be really useful. Select File > New Smart Folder in the Finder and then add criteria to the folder as you would if performing a search. For example, 'kind is image' and 'last opened is in the last one month'. Then click Save. This folder will always show files that match those criteria, automatically updating itself so it stays current. Another great timesaver is to select several items in the Finder then choose File > New Folder With Selection, which places the items into a new folder automatically.