>  Has anyone got dual playfields working with 8 colours in the foreground
>  and 8 in the back using the new display libs?

Here's an example of a dualplayfield for AGA machines with two 16 colour playfields. It
can be easily modified for 2 8 colour playfields (don't forget to remove the
DisplayControls command), but I can post you the same example for ECS machines if you
like (I tried it last night).

-------%<--------------------------------------------------------

#agapalette=$10000
#dualplayfield=$20

VWait 50 : BLITZ

BitMap 0,320,256,4      ;\Couple of 16 colour
BitMap 1,320,256,4      ;/bitmaps for dual playfield

InitPalette 0,32        ; 32 colour palette (2x16)
For i.w=0 To 15         ; reds for foreground
   AGAPalRGB 0,i,i*8,0,0
Next
For i=0 To 15           ; greens for background
   AGAPalRGB 0,i+16,0,i*8,0
Next

; copper list for AGA dualplayfield, 8 planes, 32 colour palette
InitCopList 0,42,256,#agapalette|#dualplayfield|$8,8,32,0
; set second playfield to use colours 16+
DisplayControls 0,$0,$1d00,$0

CreateDisplay 0         ;\
DisplayBitMap 0,0,1     ; >Usual stuff
DisplayPalette 0,0      ;/

Use BitMap 0            ; circles in the foreground
For i=1 To 50
   VWait
   Circlef Rnd(299)+10,Rnd(235)+10,10,Rnd(15)
   DisplayBitMap 0,0,1
Next

Use BitMap 1            ; start filling background
Repeat
   VWait
   Circlef Rnd(299)+10,Rnd(235)+10,10,Rnd(15)
   DisplayBitMap 0,0,1
Until Joyb(0)

End

-------%<--------------------------------------------------