I have a bit of an office supply issue, I guess you could say...
I love Sharpies, in all sizes and colors, and Pilot G-2s in all colors and sizes :D
And you know what would be really fun? Different lined papers to practice lettering (like the old penmanship paper?) and whimsical lettering books. I follow some FABULOUS videos on YouTube about lettering, but maybe it would be fun to practice away from the computer too.