Well very randomly after posting that I started looking around the forums, not for anything in particular but I ended up in a thread which had a link to this thread!
Wish create-your-own was just added into the game as part of the feature when it was introduced. I constantly use a similar-looking bathroom design, for example, and would like the option to save it! but thanks for the link
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I don't know if there is any out there, I'll need to have a look around later when I get home. Thanks for reminding me though!
If you do find any please post a link, I'll do the same if I'm successful!
http://forums.thesims.com/en_US/discussion/751517/create-your-own-blueprints-tutorial-with-pictures-update-download-blueprints-too
I've not had a chance to read through it all properly and it seems some of the picture links are dead but it's a step in the right direction anyway!
Hopefully it's some use to you.
Happy blueprinting!