Kettlebell resistance training examples...

If you're just looking for exercise variations...

Upper body

Shoulder press
Seated shoulder press
Z press with kettlebell
Kneeling press
Bottoms up shoulder press
Bent press
Push press
Push jerk

KB floor press
KB single arm bench
Pushup variations (Close grip, wide grip, Feet elevated, deficit, one arm etc)

Vertical and horizontal pulling movements are always harder, as I've said before you really need a pull-up bar or a TRX or similar to train the back effectively-

KB row
Renegade row
After that I would suggest pull-ups variations, fat man rows / inverted rows etc

KB curl (Two hands if necessary)
KB crush curl
Curl in bottom of squat position

Overhead tricep extension
Seated tricep extension
Lying tricep extension

KB front raise
Windmills
Halos

Bands might generally be better for a lot of the accessory work, especially for training the upper back.

Lower body-

Goblet squat
Goblet squat with curls or press outs
Reverse lunges
Walking lunges
Skater squats
Single leg box squats
Split squats
Bulgarian split squats
Rack position squats

Swings two handed
Swings one handed
American swings
Banded swings

Clean
Snatch
Hang clean
Hang snatch
Clean and press

RDL
Single leg RDL

Other stuff / whole body

Russian twists
KB side bends

Turkish get up
1/2 get up

Suitcase carry
Overhead carry / waiter walk
Rack carry

Complexes... Clean, press, one sided squat, swing (change hands), repeat etc.

Then you can also do the above in the context of doing them pre-exhausted... Or doing ladders... Or supersetting it with something else... Or with pauses Etc

There are obviously many exercise variations you can do even with just one piece of equipment. But just doing a mish-mash of exercises to keep things varied is not really the point, the question is what is the overall programming.

- Upper / lower split?
- Whole body training?
- High volume will likely be required on some exercises, or else increase the difficulty of the variation you're choosing by using pauses and pre-exhaustion if the 20kg is far too light for you
- Do you want to do density training where you're hitting a certain number of swings or snatches in a time period, the way a lot of classic kettlebell programming involves?
- How many days a week do you want to train?
- Do you want to add in a day of hard running, and a day of easy running?

Worth looking at kettlebell programmes by Pavel Tsatsouline, Dan John, Jeff Martone and others.

If nothing else it's worth making sure you really know how to swing and snatch correctly. I like the russian "hard style" taught by Pavel. It is one thing to let a kettlebell float around when swinging it, but a totally different beast to explode it from the bottom and then to engage your lats to dramatically halt it at the top of the swing and send it hurtling back down to begin the process again. When you learn how to swing "hard style" it genuinely becomes a different exercise.