perhaps here:

hallo
ich nehme gerne beide namen und datum mit schönen Eheringe oder ein doppeltes herz mit beiden namen und datum

There are some lovely designs on this site. Look at Alphabets and the embossed swan font. There is also a wedding font. Margaret

Monogram towels are a really elegant gift. Or use the Embossed Swan Font, or any of the embossed fonts with just their Christian name initial.
His and Hers, or if they have a sense of humour: Boss and Slave; Mine and Mine. LOL!!! Or if you know what their pet names are for each other you could really surprise them.
Anything but Bride and Groom, which is really only applicable on the day, the novelty will wear off long before the towels wear out.
Hugs n roses, Meganne

I have done black names on white . Stunning and goes with any decore. Again as Meg suggested the Swan embossed font is SIMPLY STUNNING. So good luck and hope to see end result posted in Projects :)

I see you have found the doves - hope you share your finished towels with us in PROJECTS, soon.

Hi I did 50th anniversary towels. I put satin in the background , a floral frame and their initials. Came out gorgous. They made a BIG HIT! They also look ritzy. I posted them in projects. Here is the URL so you can see what I am talking about. Hope this helps. Suzanne
http://projects.cuteembroidery.com/4897226/Monogram-towels.html