Get access to a band saw or something and then just cut a faily ornate gate out of MDF or something.
Make two parts and then just put some stuff in between them to get some thickness to the stuff.
This would most proparbly work best for the Eldar version of the warpgate, but an imperial style could also be made.
Here is a tip on creating 'realistic' warp gate effects, get a media player that can play visuals. Set it to warp and hit 'print screen' when the visual is the colour you want. I have built many a convincing Eldar wraithgate with this.
Either that, or get a Paint Shop Pro demo with Flaming Pears Blade Pro demo if you don't feel like dishing out the $60 for it, and do it with their effects wizard... should be Buckled Mirror, and you can fiddle with the controls until you get the picture where you want it to.
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