Regarding shelters for the long term, here's a few creative uses of materials that would ordinarily be overlooked so would have less of a scarcity
value..
'Cal-Earth', Khuzestan, Iran. Nader Khalili.
Earth-filled sandbag dwellings for refugees of Iraq war II who fled to Iran:
An idea that could be applied to the re-use of plastic carrier-bags perhaps?
'Pallet House', Bronx, New York. I-Beam Design
A quick and effective way to constuct a double-skinned structure, particularly if the void where the forklift tines go are filled with
earth/rubble/turf for added insulation and solidity.
Although chances are that unless you're quick off the mark to get a hold of materials to rebuild, items like shipping pallets will be likely to be
chopped up and burnt as firewood
And lastly...
Mason's Bend Chapel, Hale County, Alabama. Rural Studio
A gathering space for a rural community using recycled/donated materials.
The particular feature here is that the glazing panels are all vehicle windscreens from a scrapyard, which could be applied to building greenhouses or
replacing smashed windowpanes around the house...with the added advantage that its tempered and laminated so will be have greater resilience than
regular domestic glazing
The above images were taken from my copy of "Design Like You Give A Damn - Architectural responses to humanitarian crises" ...well worth buying for
an inspiring read into post-X shelter and community rebuilding
(and a whacking chunk of the cover price goes directly back to aid groups too)