I think these elastic bookmarks with pen holder have turned out very well!
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Bookmark with Pen Holder Saw it, Pinned it, Did it!
The uber functional Black Faux Leather Bible Bookmark conveniently slips over the spine of your Bible, ready to hold two pens or markers and mark up
Pagemarker Lux-Leather Bible - Cross Black W/ Two Pen Holders
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Creative Bookmark Idea: DIY Pen Holder Bookmark - DIY Danielle®