Putting it all together..

# With http://metaphorpsum.com/ and https://github.com/busyloop/lolcat
label1=$(curl -s http://metaphorpsum.com/sentences/1 | lolcat -f)
label2=$(curl -s http://metaphorpsum.com/sentences/1 | lolcat -f)

# Using colors from 'cosmic_latte'
# (See https://github.com/junegunn/fzf/blob/master/ADVANCED.md#generating-fzf-color-theme-from-vim-color-schemes)
fzf --border=double \
    --border-label="╣ ${label1} ╠" --border-label-pos=-3,bottom \
    --color=bg+:#2b3740,bg:#202a31,spinner:#7d9761,hl:#898f9e,fg:#abb0c0,header:#898f9e,info:#459d90 \
    --color=pointer:#7d9761,marker:#7d9761,fg+:#abb0c0,prompt:#7d9761,hl+:#7d9761,border:#2b3740,label:#2b3740 \
    --preview='lolcat -f {}' --preview-label="┓ ${label2} ┏" \
    --preview-window=top,border-bold \
    --separator=$(lolcat -f -F 1.4 <<< ╸╸╸╸╸╸╸╸╸╸╸╸╸╸)

• Added start event that is triggered only once when fzf finder starts. Since fzf consumes the input stream asynchronously, the input list is not available unless you use --sync.

  seq 100 | fzf --multi --sync --bind 'start:last+select-all+preview(echo welcome)'

• Added --border-label and --border-label-pos for putting label on the border

  # ANSI color codes are supported
  # (with https://github.com/busyloop/lolcat)
  label=$(curl -s http://metaphorpsum.com/sentences/1 | lolcat -f)
  
  # Border label at the center
  fzf --height=10 --border --border-label="╢ $label ╟" --color=label:italic:black
  
  # Left-aligned (positive integer)
  fzf --height=10 --border --border-label="╢ $label ╟" --border-label-pos=3 --color=label:italic:black
  
  # Right-aligned (negative integer) on the bottom line (:bottom)
  fzf --height=10 --border --border-label="╢ $label ╟" --border-label-pos=-3:bottom --color=label:italic:black

• Also added --preview-label and --preview-label-pos for the border of the preview window

  fzf --preview 'cat {}' --border --preview-label=' Preview ' --preview-label-pos=2

• Info panel (match counter) will be followed by a horizontal separator by default
  • Use --no-separator or --separator='' to hide the separator
  • You can specify an arbitrary string that is repeated to form the horizontal separator. e.g. --separator=╸
  • The color of the separator can be customized via --color=separator:...
  • ANSI color codes are also supported

  fzf --separator=╸ --color=separator:green
  fzf --separator=$(lolcat -f -F 1.4 <<< ▁▁▂▃▄▅▆▆▅▄▃▂▁▁) --info=inline

• Added --border=bold and --border=double along with --preview-window=border-bold and --preview-window=border-double