Once you've joined (it's free) you select your items on Etsy that you wish to feature. It's important to remember that it's the filename of the PHOTOGRAPH not the URL of the item that you need for this.
To get the filename of the photo, simply double click on it to get it to open as a seperate item. All you then need to do is copy the filename at the top.
Back to mosaic maker - the intention is to make these 2 x 2, so featuring 4 items altogether. Simply paste the filename of your selected photograph into one of the openings and complete the mosaic in the same way. Then click on "create" and wait for it to work. If it doesn't work, you've done something wrong, and the chances are it's the URL that's wrong - remember to take the url of the photo, not the etsy item reference.
Once done you can save the mosaic to your own pc, and then set your blog page up like this, using "Friday's Fancies" as the title and adding links for all the items you've featured.
I've not used Positivity Team members for this, and I see no reason why we should feel the need to limit this feature to member's items. I do however feel it's important to inform Etsy artists that we've featured them, so I tend to convo each person with the link to my blog page. We may even get new members this way!
All you have to do then is add a link to your blog PAGE in below and we're off!