If you happen to be both a fan of the Nord Theme and also use Apache Guacamole, you can use the following custom “color scheme” to set the SSH terminal colours to match the Nord colour palette:

background: rgb:2E/34/40;
foreground: rgb:D8/DE/E9;
color0: rgb:3B/42/52;
color1: rgb:BF/61/6A;
color2: rgb:A3/BE/8C;
color3: rgb:EB/CB/8B;
color4: rgb:81/A1/C1;
color5: rgb:B4/8E/AD;
color6: rgb:88/C0/D0;
color7: rgb:E5/E9/F0;
color8: rgb:4C/56/6A;
color9: rgb:BF/61/6A;
color10: rgb:A3/BE/8C;
color11: rgb:EB/CB/8B;
color12: rgb:81/A1/C1;
color13: rgb:B4/8E/AD;
color14: rgb:8F/BC/BB;
color15: rgb:EC/EF/F4;