My 2016 tall indoor stands can be seen in this earlier post. I subsequently painted the bases as the next photo shows.
For outdoor games where tall stands are required, I recreated the same effect by using 3-foot garden canes topped with similar lengths of wire. The SB.2 and indeed all the models in this post are 1/72 scale.
For shorter stands I again have developed indoor and outdoor (or hard and soft surface) options.
The former are made from bent wire clothes hangers.
An Israeli F-4 perched atop a bent wire stand.
A rather better view of the bent hanger idea. In this case my Fairey Battle is clearly having a bad day.
Back in the great outdoors, the Mk.1 short stand was simply a piece of stiff wire with one end thrust into the lawn and the other up the tailpipe, as with this Mirage III above. And I think that's as many double-entendres as I've ever managed to fit into one photo caption...
The Mk.2 short stand. A more sophisticated and considerably less wobbly approach is to use an outdoor wine glass stand. These can be found cheaply - mine were £1 to £1.50 each and the aircraft can be perched reasonably safely atop the structure - as with the brace of F-104 above and the Allouette below. From my own experience this is by far the best solution and also copes with diecast metal models!
Of course, if you have other ideas, let's see them!