Creating tiny printables is so much fun, I didn't want to hoard all the excitement for myself. The process of making scaled miniatures is really pretty simple, but it's something I didn't understand for a while, so I thought I'd share how it works.
All you need to make miniatures to scale is an understanding of what scale you are using. Playscale, the scale for Blythes, is also called 1/6 scale, meaning that everything is 1/6 the size that it would be for you and me. To make any paper item (like newspapers or seed packets) the right size for Blythe, you just print it out 1/6 as big as the original object.
To demonstrate this fact, my dolly, nerd that she is, asked me to make her some 1/6 scale Magic cards. To do this, I just scanned in my own Magic cards (yep, I'm also a nerd), scaled them down to 17% of their original size in Photoshop, and printed them out. Easy peasy! The percentage, 17%, is simply 1 divided by 6, as in 1/6 scale.
If you don't have Photoshop, you can also set this percentage in the print settings of whatever program you are using. For instance, if you have a PDF of a human-sized printable, printing it at 17% in Adobe Reader would make it appropriately sized for Blythe.
This same concept works for any other scale, too; you just change the fraction. Traditional dollhouses, for instance, are 1/12 scale and many ball-jointed dolls are 1/3 scale. If you're not sure what scale your doll is, you can always measure her height and see what fraction that is of six feet. Blythe dolls are one foot high, which is 1/6 of six feet, hence, they are 1/6 scale.
What will you make for your dolly?