Book cover design

Design details: i have a collection of artifacts from the past - mainly old gadgets - i am doing a book and would like a range of initially 'ideas' for the landscape a4 cover, maybe 6 roughs to think about, i will provide copy and also photographs
Ideas for the visual style: using photos of the objects
Preferred colors: roughs dont need to be in colour at this stage
Extra notes: below an initial attempt