2pF caps could come in handy with certain multiplexed LED control chips, such as from Maxim-ic.com, where speed & intensity are set with an external R & C.
Get yourself a 'scope too - download Virtual Analyser for a soundcard 'scope, or find a USB hardware item like dpscope.com. Some things you just can't check with a multimeter.
I don't know how big a GL-12 breadboard is.
Do you have wire for connecting things together?
Do you have perfboard or something to solder components to once you have a design you want to keep?
Having a 2nd pair of hands is often helpful - a Panavise or equivalent is handy when soldering.
Do you have other tools? wire strippers, needle nose pliers, things like that?
I am sure you'll be picking up some other specific pieces as you start getting into projects as well.