Need 3 postcards created for religious holiday

Hello: I need someone to create three potential mockups for a postcard. The postcard is for a Jewish program that is connected to Selichot Service (a special contemplative service that is done the evening of the Saturday night before Rosh Hashannah). I need something that is good looking that has some edge to it, but the challenge is that the program is a mix of a worship service and a great thoughtful evening... so the postcards can't be too funky because of the worship part. But, we don't want it to be too "gauzy" since we want it to seem great and cool. The postcard will be double sided and should not contain any religious images, but can contain graphics. The front side will have the graphics and some brief text. The back-side will contain a longer explanation of the evening. Once the worker is selected I will send you last years postcard (note: it is a bad design, but will give you an idea), the title of the program and all related text and institution image. The project should be developed in powerpoint and utilized in MS Publisher. All final products will have to be delivered in both formats.