When I first got into the figures, the first ones I had were a straight-arm Grunt, Airborne, and the Baroness. Then I got a Storm Shadow and a RAM.
Back then I had this little bag (we would call it a camera bag now) that looked like a little backpack. My entire collection fit in it for easy transport.
Airborne was the JOE in charge, because of his brighter uniform. He captured the Baroness and was waiting for the rest of the JOEs to show up, which coincidently so was I...

I basically bought all my own GIJOE,unlike Star Wars where I ended getting about 12 figures for Christmas way back when.
As I got more JOEs, the battles became more grandiose. I had Lincoln Log buildings, Tonka Trucks, some of my Brother's Fisher Price rescue vehicles (I built armored cabs to cover the open driver compartments out of cardboard), and this really cool Nylint? DUKW my Dad had (must take pictures to post).
I would carefully set up the characters in different places around the living room and then base the adventures from there.
In my bedroom I had JOEs climbing up the bunkbed to reach an objective.
Sometimes I just went with the idea of 3-3/4 action figures interacting in the real life environment (crap, Small Soldiers stole my thoughts...)
I'd double the troops by having my Star Wars figures appear through some type of space portal (crap, DS9 stole that one too) to seek the JOEs help. Luke Skywalker sparred with Snake-Eyes and Storm Shadow, ninjas vs Jedi. Ace got checked out in a X-Wing, while Mainframe worked with R2 and Threepio.
Later on I managed to get enough figures that I had to carry them around in an OD metal ammo container. It was stamped ".50 Cal Ammo 200 Rounds"
Around 1989 a lady from my church stopped by to drop off a huge box of vehicle parts. can't remmber what all I got, but after setting everything to sort there was a two foot by six foot section of the carpet covered in parts/shells.
I didn't buy a lot of my vehicles at retail, instead I'd get them from the giant flea market I went to every year. I know one year I got a complete Night Raven, others years got me various SnoCats, and a couple years ago I got a awesome MOBAY w/Steeler for $20. Sometimes people would sell JOEs in bushel baskets for 35 cents each and I would buy as many as I could.
Back in 2004 I got an APC, a VAMP, and a few smaller vehicles for $15.
Two years ago I got a TBP, a STUN, a 'battle-damaged' WHALE shell, and a bunch of other vehicles for $60.
Gotta love flea markets.
My earliest attempt at customizing was actually taking the arms from a Flint v1 to replace the broken thumbs on a Snake-Eyes v2. I didn't know about the tattoo then. Last year, thanks o Raspuin, I managed to score two Snake-Eyes v2s and got replacement arms.