If this is a cremation urn........then it will most likely be displayed on a table......I would use one of the plastic backed oasis wreaths and 'hinge' the wreath to drape down the from of the table.
Another option is to elevate the urn on a stand and have flowers positioned low down on the front of the wreath,
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Instructions on 'hinging' a wreath: Using the plastic backed oasis wreaths, before soaking the wreath, score a line in the top of the foam to mark your cutting lines....ideally, you should have 2/3 of the wreath flat on the table to allow for stability and a third cascading down in front.
Take a hand saw and cut down through the foam to the plastic and then continue down cutting down to the flat part of the plastic backing.....DO NOT CUT ALL THE WAY THROUGH.....Then bend down the wreath, You can then udd some hyacinth stakes, additional bracing, wire, etc to add stability if you feel it needed. THen you soak the wreath and make your design.
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You can use the mache backed wreaths....but since mache is a paper based material......you run the risk of the mache backing tearing at the hinge point. That is why I use either the 15 inch or the 21 inch oasis plastic backed wreath forms.