I've seen a book advertised on amazon called 'your name in kanji' or something like that, but I don't know about websites.
As Nahoko said, it's very unusual to write foreign names in Kanji, but not totally unheard of (an example in the news at the end of last year was the Brazilian born Japanese international footballer Alessandro Santos or 'Alex' who adopted the kanji 三都主 for his name, the characters meaning 'three', 'metropolis/Tokyo' and 'master' or something like that), plus its entertaining to choose kanji for your name: you just have to find characters you like which can be pronounced the right way.
To write Debs' name, you need kanji for the sounds 'gou' 'mu' and 'ri' for 'Gormley'. (I gave up on your first name, mainly cos I could find so few kanji for 'de')
You could have something like:
豪夢利
This uses the 3 characters 'gou' meaning magnificent, 'mu' meaning dream and then 'ri' meaning benefit or advantage.
This is just a result of a quick look in my kanji dictionary, I'm sure someone can come up with something better, but at least they all mean nice things. (I know that the final character isn't the usual long sound, as seen in Nahoko's katakana, but I reckon you can get away with a short 'ri' in Debs' surname, especially as making the sound long would mean adding an extra kanji!).
To give you an idea of other less-nice characters that could be used, 'gou' could also mean torture, 'mu' could also mean spear, and 'ri' could be the character for diarrhoea!
PS I've written the kanji in normal Japanese text. I dunno if you can see that, Debs? Unfortunately, I don't have any software on this machine to capture it as an image...