I am making a cake with two tiers, but the top tier is an odd shape. Does anyone have an idea as to what I can place it on?
It is to be placed directly on the bottom tier, with dowels for support.
I have a thin cakeboard (the kind with silver) but they are difficult and expensive to come by in Denmark, so I'm loath to cut it to pieces.
Any suggestions are welcome.

How about thin foamcore cut to the shape of the top tier? Maybe you can trace around it and cut about 1/2 inch in from the outline with an exacto knife.

Never used foamcore before so just an idea. But I did just do a carved cake (here is a link - http://www.cakecentral.com/modules.php?name=gallery&file=displayimage&pid=1350261 ) which was an odd shape and I used an 8" cardboard cakeboard that I cut to shape.

Maybe you can get basic food safe cardboard and just wrap it yourself with foil or parchment.

Just some ideas...hope they help.

Cut the shape you need out of any old cardboard box. Then wrap the cardboard with something more foodsafe such as cling wrap or aluminium foil. Just a suggestion