You can make any filter profile you like, using crystals, as long as the bandwidth is not ridiculously wide (more than a few kHz). The necessary factors are: source/load impedance versus crystal (characteristic) impedance; and coupling between crystal(s).
From the other replies, it sounds like you want a repeated pole filter, or something more linear-phase?
Obviously, you can always get a single pole pair from one crystal.
The standard network is a series chain of crystals. Coupling is controlled with a capacitor to ground, at each node between crystals. Crystal frequency is trimmed with a capacitor in series with each crystal.
Beware spurs: crystals resonate at frequencies above their cut frequency, with various bandwidths, impedances and couplings. A quality filter system still needs modestly high-Q LC filters to help attenuate these.
Tim