These fascinating pieces of aqua blue sea glass were found along England's North Sea. They are each just under 1/2" wide. They both have some layering and swirls of aqua and teal within.
The swirled look originates from molten glass that was mixed together with other color(s). This resulted in a multi-hued chunk that was then discarded into the sea. The piece has spent many decades in the surf being shaped and conditioned.