In Jainism, when attending the opening of a new house (also known as Griha Pravesh), it is customary to give gifts that reflect the core Jain values of ahimsa (non-violence), simplicity, and spiritual upliftment. Some suitable gift ideas according to Jain principles include:

1. Jain Religious Books: Scriptures such as the Tattvartha Sutra, Jain Agamas, or books on Jain philosophy and ethics.
2. Images or Idols of Tirthankaras: Especially of Lord Mahavira or other Tirthankaras, for home altars or prayer rooms.
3. Swastik or Jain Symbols: Sacred symbols like the Jain emblem, Om, or Swastik for auspiciousness.
4. Puja Items: Such as lamps (deepak), chowki (altar stools), or puja thali sets, which can be used for daily worship.
5. Plant or Sapling: Gifting a plant is considered auspicious and aligns with ahimsa and environmental consciousness.
6. Sweets (without eggs or animal products): If giving edible gifts, ensure they are pure vegetarian and preferably prepared without onion, garlic, or root vegetables, according to Jain dietary restrictions.

It is advisable to avoid gifts made from silk, leather, or any material involving himsa (violence) to living beings. Gifts should embody the spirit of non-attachment, purity, and goodwill, in line with Jain values.