With zsh and with libnumbertext-tools's spellout on Debian:
#! /bin/zsh -colors=(${(f)"$(<log1.txt)"})adjectives=(${(f)"$(head -n ${#colors} <log2.txt)"})/usr/lib/libnumbertext/spellout -l /usr/share/libnumbertext/en \ -p ordinal 1-$#colors |for color adjective in ${colors:^^adjectives}; do read num && print -r The $num color $color is $adjectivedone(note that it's US-English. For instance, for 101, you get one hundred first instead of one hundred and first)
If you can't install zsh or any software that spells out numbers but have a list of English ordinals in a third log3.txt file, you could do in most shells including bash (Bourne-like, rc-like, fish at least):
#! /bin/sh -awk ' BEGIN {while ((getline a < "log2.txt") > 0) adjective[na++] = a} { if ((getline num < "log3.txt") <= 0) num = NR "th" print "The "num" color "$0" is "adjective[(NR-1)%na] }' log1.txt(falling back to <digits>th if we run out of English numbers).
