Hi Jane. Not exactly what you might be looking for but, have a look at Viktor Koens works. He does pretty bizarre but interesting things. You can view his Toyphabet at here.

You might also like Exotica.

Not luscious as the sample, but in the same vein:
http://www.dafont.com/treelike.font
Even less luscious:
https://www.youworkforthem.com/product.php?sku=T0622 (font two)

Scriptorium also has some decorative initials.

And this:
http://exclamachine.com/Typefaces/!Limberjack.html

Thanks guys, I'll check the links out!

This, too:

http://www.dafont.com/kingthings-annex.font

Also, have a look at this high resolution letters by Novo Typo

Our work is shown above (Pure typeface). We are available for customized typedesign (photographic or vectorized type-illustration) - a complete typeface or just a few characters.
Please check the website:
www.novotypo.nl
or mail us for more info:
info@novotypo.nl
Mark

Beautiful.

hhp

To answer my own question: the initials are Italian ornamental letters dating from 1839. They can be found in a book by Laurence Scarfe called "Alphabets: An introductory treatise on written and printed letter forms for the use of students".

http://justsomethingimade.com/2010/11/vintage-alphabet-christmas-books/