try http://www.designsbypetro.com/lavender_embroidery_design.html

First of all: do not worry about file format. If you find a pretty design there are free tools to convert it to a fitting file (99%).
Just take a look in our software section, the programms are Wilcom Truesizer, Tajima Ambassador and EOS (my favourite).
For a lavender sachet (design is not REALLY a lavender) http://www.sewingonthebeach.com/freedesigns.htm
and here you have a potted one
http://www.designsbypetro.com/lavender_embroidery_designs.html
if it does not have to be a freebie
http://www.secretsof.com/embroiderytips/results.php
and here is a twig with border
http://www.aljaydesigns.com/designs-le5x7.htm
That is it for the moment.
CU
Eva

Here is some lavender for you:
http://www.starbirdstockdesigns.com/asp_pages/catalog.asp?kwsearch=lavender

embroidery library has a few designs