The four coloured ring surrounding the cross represent the four Gospels – red= Matthew; yellow = Mark; green = Luke; purple = John. These are Gospel colours in some liturgical traditions. The Lindisfarne Gospels are part of the same tradition as St Cuthbert, and it seemed important to include them, and to surround the Cross with the Gospels.
The Cross is set in a sea of blue, and the outer circle evokes the various landscapes in which Cuthbert travelled and settled. Heaven and earth are represented with colours of light of morning and evening.
The whole concept is intended to draw the eye to the centre and for the surrounding shapes and colours to set the Cross in a place of intersection and relatedness to everything else. Hence the four bold coloured triangles, four corners which act as hinge points holding but not confining the overall structure.
At least that's what I think I was doing 
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