This thread should be stickied!
Well since that ain't happening, I'll bump it with a quick tip...
Making a wedding cake pillar into a flight stand
Making a wedding cake pillar into a flight stand
Take wedding cake pillar and saw off any preexisting base. Give pillar rough break at height you want to attach the mini at {Plan now for how high you want the fig off the ground and how balancing might be an issue ]
Glue figure to regulation base for game it will be used in.
Fill hollow pillar with cheap weight, rocks and sand can work well. Near the top, use a non water based glue to seal the weight in. Use normal filler on top of pillar.
In your order of preference, paint and assemble the figure.