For what it's worth, my own submissions featured:
(1) a 21st century version of the medieval Groat based on those of Henry VII and VIII - which in its day fulfilled a similar role to the pound today;
(2) a Union Jack background on the ring with a retained £1 Royal Shield (and hence the option to reuse previous annual constituent nations editions in later years) on the pill;
(3) Parliaments and Assemblies of the UK - sadly I was refused permission to use their emblems, so had to go for the physical buildings instead, with or without the Westminster portcullis (that's also on the old thrupenny and penny);
(4) the complete series of Dent's pence coins making up the Shield with a modernised "crossword" ONE POUND logo design;
(5) British Justice, with a quote from the Magna Carta - virtually certain to be the subject of commemorative coins next year - as well as the emblem of the Supreme Court and Lady Justice from the Old Bailey;
(6) Elizabethan Drama, with quotes from Shakespeare, Jonson, Marlowe, Kyd, Webster, Dekker and Middleton as well as a picture of the Swan theatre; and
(7) a combination of (3) with a partial version of the Shield on the ring.
Let's hear others' ideas/designs? We have to while away the time over the winter months while the committee laboriously works through its submissions pile somehow ...