Bill has a point when it comes to the maintenance issues....they tend to crud up ....push up in winter if the foundation isn't drained right but if you are going to do it then consider using a rubber animal watering troth/dish....they can be had at tractor supply and home depot as "garden ponds"...at least at ours... and are thick and hold up well....place rocks around the edge to hide it and if a water fall or stream is in the plans ....a submersible pump will do good but the intake will clog quickly if leaves get in.....my grandmothers dog loves her garden pond and is a major cause of water loss and contamination....drain it for winter and take the pump inside...line your stream, if doing one, with rubber as well.....one piece if do able......an inner tube for a good size tire would work pretty good.......spray glue some small gravel to it for looks and hide the edges with rocks, sand, dirt and plants....if no fish ....bleach will slow the algae but kill plants as well....all I can do is give info and opinion....up to you in the end.....they are neat and look good if done right but can turn into a lot of work....get the wife to help and things will be easier.
Later All.......S.B.
Later All.......S.B.