I think i get it now, few ideas:
shower bouquet, tear drop or half shower, oasis posy uses bridal holder (icecream cone i call it) that is the medium. Usually used for traditional type bouquets arranged in the oasis holder. The only flowers that would be difficult to use in them is really thick stems like amaryllis and really thick calla oh and soft stems although they could be wired like hyacinth, popular flowers would be roses, mini calla, freesia, any of the fillers and foliage usually soft ruscus, tree fern, ivy, bears grass, leather fern, eucolyptus.
Pomanders for flower girls (puke), the oasis ball would be the medium. Usually use small flowers like spray roses, hyacinth pips etc to get a nice ball shape
Baskets for flower girls, the basket would be the medium and small flowers again usually roses, freesia, tulips etc
there are also a number of novelty items you could mention, wire frames, twiggy frames and baskets, oh cornocopia

Funeral work: there are all the bases which would be the mediums: closed heart, open heart. pillow, cushion, gates of heaven, crosses, posy pads, wreath....they are the most common ones which can be either based with usually double chrysanths or carnations, or they can be textured using different textures and shapes of foliage and/or flowers. there are a million other shapes like motorbike, car, guitar, bunny, teddy etc which are usually based so that they keep their shape and you can see what they are supposed to be. Posy pad, crosses, open & closed heart, wreath, spray holder(for single and double ended sprays) are also done with mixed flowers and foliage

Arrangements well that is a mindfield, my brain is a bit frazzled after funeral work, but a few ideas: vases, are plant arrangements counted that would be soil as medium, baskets, china pots, baby china posts in shapes of trains, bears etc, if you were to make a birds nest type frame work from twigs or wire I think that would be counted as a medium and thread the flowers through it like calla, tulips that have bendy stems

I hope that helps you gill and I havent just waffled on about a load of poo