Lately, I've been obsessed with this idea.  Making a "book" out of Rolodex cards.  I stumbled on Robyn McClendon's YouTube channel where she demos how she made her "book" and I have found the process so satisfying.  Gelli printing has always been a favorite of mine but collage has not.  Working on this tiny scale (2-1/4 x 4) has enable me to experiment with a lot of ideas quickly.  Making art takes a lot of practice and now, I've found a way to hone my skills and have fun in the process. 
I'm also making cards that re-use my existing art but also including commercials products like Washi tape, stencils and stamps.  And, I've added to my paper collection a lot of transparent materials and love working with these as well.
I bought my "Roladex Tray" on eBay since I couldn't find any on Amazon or at the Office Supply stores.  Perhaps it's been discontinued.  I bought the cards but returned them since they were so flimsy.  I find the old cards are better.  
If you ned some inspiration, just subscribe to her channel.  You'll have a lot of fun, I promise.
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A friend of mine sent me this photo of an exhibit she saw at the Museum of Contemporary Art in Boston.  I wanted to learn more about the artist and this work so I wrote to the museum and they responded immediately with the information I requested.
​The artist is Yinka Shonibare MBE and this installation is a celebration of the diversity of the American population.
The books are covered in the artist's signature Dutch wax printed cotton textiles and on many of the spines, printed in gold, are the names of people who immigrated to America.  Also included are descendants of immigrants who have made major contributions to America including: W. E. B. Du Bois, Maria Goeppert Mayer, Steve Jobs, Bruce Lee, Ana Mendieta, Joni Mitchell, Toni Morrison, Barack Obama, Steven Spielberg, Carl Stokes, Donald Trump and Tiger Woods.
I wonder what Donald Trump would think, being included in this list given his anti-immigrant policies!
Unfortunately, this exhibit has closed in Boston but will be traveling to the Minneapolis Institute of Art and the  Cantor Arts Center at Stamford University.
​I wish it would come to Denver!

Lately, I've been watching a lot of YouTube videos about book-making and one artist I have been following is Natasa Marinkovic who lives in Melbourne, Australia.  Her YouTube channel is "Treasure Books".
She made a video
 https://www.youtube.com/watch?v=cadOAahftcM 
showing how she made a version of this book and I tried it out today.  I really liked the results and the fact she uses machine sewing to embellish her small pieces.  Fun way to use up your paper scraps.  I cut out my shapes from decorative paper and then backed them with commercial card stock and sewed around the edges.  I suppose you could save yourself a lot of time by simply using card stock that was printed on both sides.  But I didn't have any of these!
I have used this type of "binding" before and, of course, the covers (I used paper instead of fabric because I thought it would be more complimentary to the insides).  
Besides her creativity, I just like listening to her voice.  Not true with many of the crafters on YouTube who I turn off during the first 10 seconds!  
Natasa has shared so many of her techniques (very generous!) that it's worth dipping into her channel to see if any of the ideas stimulate your own creativity.  I think she's one of the best and worth your time.