Considering I didn't have any official toys until not too long ago, I had used a bunch of randomness basically whatever around that was even remotely phallic.. or had enough vibration. Embarassing but gotta do what you gotta do!
CPAP machine tubing. I had sleep apnea (my throat would close partially while I slept, causing me to stir during the night and never reach REM sleep), and this little machine would blow air up a tube, through a mask on my face, and into my nose to make my throat stay open when I was asleep! The tubing wasn't very big (or very effective) but I was about 16 at the time, and I was really horny! XD