I would love to see a better receipt organization on OneNote. We should have a pre-defined page(s) where all of the receipts we capture through Office Lens displayed in a thumbnail view and clickin/taping on a receipt will make it full size for better viewing.
This feature is somewhat available now, but it can be improved and there's probably a lot of demand for this feature.
Microsoft take note: this is an opportunity to take market share from Neat Receipts (neat.com). I'm moving away from Neat and using OneNote to managed my paper docs that are being scanned (digitized) with the help of Office Lens on iOS. For small documents like receipts or warranties, I'm loading the scans into OneNote. For large documents, the best solution is to just link to the file location.