take care of the pennies and the pounds will take care of themselves
contribution
contribute
piggyback
pad out
supersize
top-up
small rain lays great dust
expandable
big things come in small packages
reservoir
enlarge
smallify
resize
heapful
adder
compress
magnify
fill-out
a mite
a little of something goes a long way
mastodon
make a federal case out of something
arseful
spit in the ocean
drop in the ocean
giantize
drop in the pond
drop in the sea
incrementally
lesser
stockpile
dovetail
multisize
multiplicable
enlargement
small-time
subanalysis
in miniature
upscaling
magnification
a tad
many a mickle makes a muckle
a bit
size
mingle
unify
schmear
pale into insignificance
whatabouts