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You could go to the hardware store and ask for the 3M brand adhesive hooks (sold year round but pushed heavily during holiday season.) They stick to the wall and can hold a fair amount of weight, and when done with the pics, you pull a tab and the whole thing comes off w/o leaving a mark. Run less than $5 for a two pack.
Would work well IF the pics are not too heavy and if the walls are painted (raw concrete or block walls would not offer the best bond.)
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