Does anyone have ideas on decorating a cake with the theme of a mountain range?!

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Ya really need to OD on The Food Channel and Cake Boss on the Discovery Channel - - - please ignore other answer, hacking away on a rectangle cake will barf.
That Said - - - -yes use a large size rectangle cake as your base; atop that base place three times x's six progressively smaller round cakes and two cupcake sized cakes - - - you now jhave a visual. To create a truly Mountain effect stagger your round cakes, and naturally the cupcakes become the actual Peak - - - you can even use a third curpcake to create a twin peak effect. Each layer will need to be 'anchored' with a thicker plaster like frosting.
The most fun you should be able to have is with the frosting - - - naturally white for snow, green for the lower slopes, you can even create a mountain stream tumbling down.
There are ways to craft bouldrs and rocks as well BUT if you don't feel up to it, just rely on the frosting.

Peace////////////////////\\\\\\\\\\\\\…

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The cupcake tier effect sounds like ALOT of cake (depends on your numbers!).

For my son's last bday he had a Volcano cake ~ ... I used a 'Dolly Varden' Cake tin (check out ebay or cake suppliers - Wilton cake tins)

This creates your mountain form in one simple cake I then used icing and added effects such as - rock candy, chocolate honeycombe, dessicated coconut which you add a little green food colouring to make it look like grass etc, white chocolate melted and poured over the tip of your mountain = snow etc

Enjoy the party :)

PS ~ I have also used this cake tin when making an ice-cream cake and then poured berries over just before serving ~ it was fantastic! :)

Experience :)

Do it like chocolate icing on the base (or towards the "front" if its flat) and then make peaks with white icing for the snow. You could also get blue and green in those little tubes and make some grass at the bottom or rivers coming down. Idk what shape your cake is.

If you could stand a rectangular cake on it's side and then cut it in the shape of mountains like peaks, and then use the other half and kind of put it on the front to make it three dimensional (well more so) like the foot hills. I'm thinking its like 4 layers. 2 and then you cut the peaks out, and then put the remainder on the front. if that makes sense at all...